GMC Sierra Hybrid 2011 Owner's Manual page 15

3. Align the front edge of the side
rail with the front inside edge of
pickup box.
Clamp
Installation
1. Position three outer clamps (A),
on each side rail. The positions
on the siderails are marked
CLAMP.
Storage
2. Position the grooves of the
clamps on the side rails (A)
using the center groove (B).
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